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Whether you surf the Internet with a computer, smartphone or tablet, always install all operating system updates.
All common operating systems offer automatic updates. The device then periodically checks for updates itself, downloads them and installs them. You should not deactivate this function.
Tip: In the security overview of your 1&1 IONOSs you can see from the list of the last logins which operating systems have logged into your 1&1 IONOS.